Tray blank



FIG. 1 is a top plan view of a tray blank showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side elevation thereof; the right side elevation being a mirror image;

FIG. 4 is a front side elevation thereof; the rear side elevation being a mirror image.

The solid lines in the top and bottom plan views represent through cut lines in the blank material and the dashed lines in the top plan view represent fold lines. 

The ornamental design for a tray blank, as shown and described. 